Is there any extra charge for purchasing app
Suppose i am purchasing app of ₹700 so is there any extra charge other than ₹700. And if we remove payment method after purchasing so is there any problem
iPad, iPadOS 14
There might be an extra charge if there are taxes on purchases where you live.
There shouldn't be a problem, but see the 2nd article below.
Apple ID without a credit card
Apple ID - If you can‘t choose None when you edit your Apple ID payment information.